Lisa Stewart has seen the light - unfortunately she can't explain it.

In a mystery worthy of investigation by Mulder and Scully from TV's The X Files, strange circles of light have appeared around Lisa's home.

The lights are perfect circles with a pronounced X at the centre and have baffled experts.

They appear suddenly on buildings, pavements and other surfaces when the sun shines and can last for hours, days or weeks.

But in a spooky twist, the lights appear only to be visible to certain people.

Lisa, 36, first saw the mysterious beams six years ago and took some photographs but thought little more about them.

Then, as summer warmed up this year, the Xs began to appear again.

At first Lisa, of Clarendon Road, Hove, thought they were reflections but she has been unable to find an explanation for them.

She said: "In the last few months, I've been seeing a lot of these circles in my garden, around my house and around Brighton and Hove.

"I think they are a strange phenomenon, on a par with crop circles. I know other people have seen them but I think you have to be receptive to them. Maybe I've seen them be-cause I've been looking for them."

Lisa's children, Holly, eight, Fern, nine and Dale, 12, have seen the lights.

Lisa, a homeopath, healer and musician, said: "My daughters have also seen angels which I couldn't see, although I could feel their presence. They are not worried by these experiences and nor am I."

Similar light shapes have been seen around the world including Norway, Germany, Slovenia, Canada and the USA.

Some have been squares, rectangles or fatter star shapes. Closer to home, similar lights have been spotted on the walls of the Jarvis Hotel in Guildford, Surrey.

Lisa would like to hear from anyone else who has seen the light circles. Call her on 01273 262408.